package collection;

import java.util.*;

/**
 * @author xiaoming
 * @version 1.0
 * @date 2019-03-01 7:10
 * 6.3 集合初始化
 **/
public class CollectionInitialization {

    public static void main(String[] args) {
        List list = new ArrayList();

        Map map = new HashMap();

        System.out.println(1<<4);
        // 0000 0001   <<4  0001 0000
        // 128 64 32 16   8 4 2 1
        System.out.println(Math.round(-1.5));

    }


}
